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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee7aaeef472ed0fbd1779408615d52b12e34fa49ca92ee3c4da8d488563bcb3' 
  AND token = 'Yk8du8+xH2mTJ1m8Dqm/EsI5S4OnE5+XuY3ggk63pWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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