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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1087e0d572eda6ce7aefa425d0d2b63a345f8135b895e49f1e4af6f6d51959a' 
  AND token = 'UwxdxTDb2c8EO5D1p+fO/QZnRXdI7yHsluLhjHDrzuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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