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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ca1ff5fe2941b4352fe30a9d0d7b848a883ca2ac34729df28204e76dabc7d8' 
  AND token = '+SWI6u/4szmIWMfGZ7bYhHfikY+wfcWNeAD9f3/QzmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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