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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6792638460178c9d94ea2d4a34406648e6942504f35c13c3ead17cef9cbb471d' 
  AND token = 'VHipQiJNrMeEi5/Q4zFMAHNo+8Qjc6zJBCzQX3G89Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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