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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d2c9a2ddab8e7c2cbae7daf3b7a0d4c4db63570400699da4af8f553689770b9' 
  AND token = 'Nl5rVuqyIEOUJGI2HRT3x3/4FfwF46p++J7mZ1BAmZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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