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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f7e847172e338540436393d3f94623faac4ca079cdc1bed171f5aa927fcd6e7' 
  AND token = 'CRVe9O40TOr24IXAStlIOGwd984hTs+hlHdZhqMPjA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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