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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '126a07ace5dec3f19e287666cb5c02861b863dab979faca69b938eef24da31f1' 
  AND token = '2rvxlYaxJ5k8Iqxk0K8KtMBCQe7kfvH1qfrY/y2EMsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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