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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87391d4f3d01e670629f7f6c71aa5f10e543c5ca0084b0308ce17bdbfe2f66f7' 
  AND token = 'ILxZZtAlMdX0U57V9p4onp+Bdkmhz8EhR+Od1TAOTGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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