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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c8cbaae1495c3de2fd4e7adf9d4ecdc3101ce585f4cf3bfa8c8364c04c1ff2f' 
  AND token = '7xOyWeieoNoTSB6D9gpi3Ih+s56qwIDihDk92wHS2do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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