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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052e95d30c666ad534af4077115b699ff8b5a11252691bb881cbcd171c7ab4e1' 
  AND token = 'RLhOkxnBcN/GRnCPHTGt4kQGBfQyff+0Hh21pIXjKwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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