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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a328f1853993bc24183fccc394e34694ddddacdce4ba89ec5f9ca6fc0ed4e1' 
  AND token = 'dtBoXuZE3UY09klhfkavyp5SKEVHu/OxG+ZNPunJeus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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