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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa7a9a4d4f73ddb5c85d9096eeb0b8b5c0fe8f731af4e063f86840ad3ce0f9e' 
  AND token = '0cVxdkQnjFETXuKW2QCVZMIFJwuguyw2l3AOzMQk9Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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