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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '133b8fc01d82e910080f7a8d75cb1ac5bc497a7561e1e6f334bf38960abd5dba' 
  AND token = 'fs31MEaD+ZrnLMo6MfC4k5vKY/EKwKq2QBX5AvN8KnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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