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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04993a5ef7f5d29c1f7c9f2256d823a5ccf317f3addd48dc0ab6e44933dcee6' 
  AND token = 'tW84G+3MQDTELuuALiCYpQcNCminsdzUMVxw1BlmzlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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