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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15a0b72b140f3609be0b77b56f4bf8b5402740e37a17a0cb549989252490042c' 
  AND token = '5Jyh7hWa9aL/uQhXhIw17ABdy3Kp2834TTeMko5DfOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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