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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9e780fd6c884eb0e2dd4d03af599eadd1a5cf83db9873701f16ab3c92b4661b' 
  AND token = 'NVUQ7Xb45WCwn761VSo3mO0W26eShb4myoVkYO/+Js0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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