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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '863e2d4dfd793599b018bd9ef95c9172c9f91c52712b81f681a6ce46f5fd53b8' 
  AND token = 'vSmCYUNWvivl5BhdCMNVAZ37SIS9fKHd/zEYcl+yEdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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