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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '348b8ceb52c5608f447052b528f0cf3155ef8ebc1c099e0612aa1804db1bd9b5' 
  AND token = 'sf8vEcdZZy/mZBSoMyZiyAsWyaStXda3mCUXPq5Vu9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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