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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53be09044ebdf82d8614bc163f343fa41d913b8534e85a45639efeaf2749fd87' 
  AND token = 'HYH09qhz4+iqGj5TN4ZnZeMUBiP9RRCdsUp9ZYHNAuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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