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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '205f4a7d5248474f8fe343a4af7ac49069c711a6418b02d8ac45bbc2e4af4798' 
  AND token = 'XmcGWaNUYdB6Xy09lVpni1kZg+gz8g2x1TiHKQkkvZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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