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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc190614835dabae96bca22b7e7c99ac60127369044d91276640f00f34512ff2' 
  AND token = 'y684XES1dQzvNR5CGw2wr8qbT84br87jFPMHepdKVu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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