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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5495e29a3483c5440546b94bfd7d8c77650b7524c3ceb428e68c07c7c0d8fd2' 
  AND token = 'pTolNx7F/m2v9ZpIiMsQzCRXsQFAqL2nP73kL7K7tvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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