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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb1f63f6710ed1b042b09ae0f6476fc415f733aa26b0dba3d137892bc54dca8' 
  AND token = 'ENudDHJ6rvvUGd2GPfQk5e425MpWFXbRUTIdm1uXarU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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