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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd9af36b6f79077ed8e231ef3b22388fc80e6652e63e1699e1c1a72816d214e2' 
  AND token = '0ieXHzwkHk/5ahIjpBLtrCLyetQMGVRE6Il/u8w3bfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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