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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe03579f99b21da302ce786160df056145774357ac5f47e89079aaeed1aad0c' 
  AND token = 'T9VWWtonp0C4AYkAxzgU4BC9pLgr+8QlDADBsNJr81s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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