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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2f4621cad1aad43b94f843385da3950d7cb746b23f6c0f4f958f4f5aa7531b' 
  AND token = 'EhbmBf/No8dRDiya2a6PkJ0c9pEmM6m252baH45bTrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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