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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f8dc889f536bcc18ce509558304654896ad7f6212591ac65f3e37e5ab920d4' 
  AND token = 'oA60bJZmv9m0yZY1Ix95fJ3CNjjaqL4h1NoDWeWBSlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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