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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5313a448272384858a8f52ad0b903660204e75a74da6da67e17dafb4828488' 
  AND token = 'NvVa5knEPf4gZev/KOYZY2qV6U0k4M0s21i1xXM6P1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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