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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938729fc4829396d6083ce33b7246f83693997b366ec4106d0559b470688374c' 
  AND token = 'DtP7b4ezzdULPYzHZ7IVZvAJ4pxwZEiqLX4cd64ZHa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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