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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0ba4955cefa533ef2efc75ff309f855abb48539c146d2bebe776aac0ae98c0d' 
  AND token = 'Fnbta2jcRVUcaZfHA0g9oYW2/vSj0r9X9C+c7Fmnyj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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