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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb80bd5e1ae0d55e098c8d27e503f9fb0d854319c93cf2a335197e94a2ddee54' 
  AND token = 'Jjocd/XAJ+3+F6asiiKv5b7XOdClosb8kDJO8lxwZyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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