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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b898491810211a458817ae6ee9a6d67d03efabad411d08a97df4ca094441b79' 
  AND token = 'RsN2TAlB2b+WX7f9j/iRcEeXFsptIrgPWFcYO8VgTUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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