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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09050c56f01b6ce957bc02946c8492d7e47b6c46b7ef4e2679e0f6273fc6112' 
  AND token = 'lb+h7nFmdWq5ZAbvoJp/mhGb200mt/PhBWzPdP0WHMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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