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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929cba64f8150384507720d9bbc53648c91ffb8199b8a9b0ad77c28645d07d35' 
  AND token = 't4I7A0FAODBOfDFEtTvA7F6YxH71rZud6cQoj2mDqSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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