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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a17ac39c336a653d6bc7d39570ade998c6bd8e76d65af736532773e630d1b5' 
  AND token = 'ZYlHAjYBx0vHnFCuEsdMWa6Em5B1WWgVTH3x0LwfQZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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