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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e95bd29208330e1538875e1a5ae3a57f57a24d4425aa7747107830c43e1cb34' 
  AND token = 'q5zsEJPPev2V4nzuQ++VBrEaTUFNXf+ilQmu74KkZo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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