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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13303a544b1e5dd1c1d5fedebad0acd4c63d01c1e1888535548676d2c3c46fc3' 
  AND token = 'RB8EK2Nl7fVTH6UCf+q9JF0J9Xa1rOBbBh/rGAGgIwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}