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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4dc321710fa733e2dae0e8bc05ed553c1297457cf1f76305c9d79174e6743d9' 
  AND token = '6gCSqW4ieTj4EfptJT62fviV37noqRMgO1HHkP416FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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