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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee48b5ffd774e19d6c96993997ac9461218a52e606184bde2a82c38787441df' 
  AND token = 'hdEXsKGRAnhzI2KPE8qrpLOyOIfHKpiqo0BQMwA7JFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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