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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a68996422aaca23a9bde5ce2b5746499b1f9e5ccc3114fd6e90287f3cda4474a' 
  AND token = 'zxc8kkvELPTUA8EYFsGmQhkWPk6kQsjnE6vXtKptBxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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