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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a704ea6228ebc6c7e13a5f6ae0d479283bf8303953a8ba0f44df8b0882eee8' 
  AND token = 'F1zuYYM9rFdzK2bDU1fCG19Zg6+zfGTHQrBmurT3ZNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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