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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71e76f0db8fc711d65f69a824cb0cbd359ad10d41c86d66d04731605606c6b3' 
  AND token = 'rwcm5I7ee8D+1BGiPUrVE8sfF82f1FgTcgbgHcijhuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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