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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c24867da3250f2fdc7c67d7968bec522da1824b492ecb18cc03202b4c9e8ea6c' 
  AND token = 'GHU+jzvadfSn3NhdUfwbvG8JCcnokCwTGtZnf6gK1jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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