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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c733de438f0c8bb563243ee4f9fc27321715e807af2808580e5c30932c67ac14' 
  AND token = '4t4UljXQdb9Icko/H/XRoK6PwPBkl5on/WpUK/LTdD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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