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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1af754b9d57a6e78603ee70d6b971cc404db7747b9ab24585957762db053e81' 
  AND token = '4DobZZTcwofYE0C61aUEfM6TIhamZfz1lasa7YOLvAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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