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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8611249cfd734a8e810386b63b5214f59f234c3a7c750d63bab5369b976ff15' 
  AND token = 'CzPZ1R0AM/L/JuLK5ynYEml4tb4cD3ZGifnoszttw0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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