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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa2c21202fa849842a360928b54786896c66d8cbc275fb77efe377fe8790384b' 
  AND token = 'iBD716vjOeO/F6R6DP0hDQcCCuCzdOu19RV57d+WECs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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