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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fefaa7a2b737c32395f0b3d2645512ef4f18fac0237ecd4ee4f02598ad810cb2' 
  AND token = 'DYbv4EX8GoLu0TDlvplPVWrjqueOv7c393+eQrSCSg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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