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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b5650be4fd599a542c528bba1179ba26bb9ff228454ee0f9a39da5c9ae9ce3f' 
  AND token = 'IvkjKTI10lBn5VfGeiRICSfFfj50icFNzJ/SFf49lxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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