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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fbeb1140e6027417b1fcabda32fcce07120a765aaced68031c39290d9e99d5d' 
  AND token = 'i/h9R1SHfNqMsqqVOPB73O//xbF8aGfMcjAwg3Mq3lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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