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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9204820e5e22749f4a451bc820b1d2c7657cbf23cc6a2ca4382e8a53a163dabc' 
  AND token = '+RxcCqaQ4NE5CPDEe9ZABFfvqo8xQ2RKYgZpoHksF/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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