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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a6169e8e8d9e3ff3feaec79ff61d74e98d8a9cdd69810c049046145b2132a3' 
  AND token = 'jILTr3WCESqwkisFhXxTeAAsDkMNeETdJJM2BGtNCMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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