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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '921e97488db946e3ffc977a1eb9af9617f46fa2ae495c1e2164e948246e044e7' 
  AND token = '0cjgamON4OZ1qR++JWN9BSr6gF+XnDfXv1Yhco3OO5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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