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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47ddb8afef266394871b3733c78eb0c2392e25e5d1a336bc6b82afa5821148b0' 
  AND token = 'EcIA8uqFowUs9M4ex729znFUPyMiWxaYj4SiDH490yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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