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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd7aac0a97d9849c60f8e294f54683c7975e77ff8f6f84c31fa6517e700d56ee' 
  AND token = 'YBi2Dk+nP89uIXw/pztBrhfJXmObHH0XzH4l//0Qyp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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