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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52ad8d6af357909ce5d7c7fba89ccdcbfec5c434dc0c4c3f844baf0cba5fdac8' 
  AND token = '+quk/csJVVqT2FE5TmX6u+W6NV8D1QB7+WJS01G1r9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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