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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eaa20efdd0aa9228eb8c9a6652648b8cc3aa0d3aae78d56246263c7abc7b04e' 
  AND token = 'JW9Jd5BXvRxa+gqEV7uIzxS+PfdkO5l720T8/iZRu2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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