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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82228acb488265af2cb395e4fd3efdb8f036649595cdacfce10184ebcf0a5d76' 
  AND token = '2dFCbu8GuYjs+gyPuneCMkL+YVMIbmCX01+2lqkGuj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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