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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd3769ea9639494e4fc6a97111de635b7a3ddbf1e9b832a7836000e0a4ee4f3d' 
  AND token = 'SqgNgzMjP7dr5euS4chSzvrWVYIWOgLM8Ayr3JVypMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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