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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c4133d07aedf6f1db9f8d2e9d185ca34a26859e19892e3c834463090142ee38' 
  AND token = 'BSHfSYNoHq4mjvrOP4ih1iBmCC80nDJXI783Ho869WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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