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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff255645a8c556dc006bc5f98f59eeae826b5847e9d92fb78432a242d54785d7' 
  AND token = 'ty9PabxFHO0bhGlNKvPr8cTw7yxPR9ZfQdULG8NhnBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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