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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a9cc2118740d050627a56912307a31e4da5237f22f34e8d67c2d3c14500e8d' 
  AND token = 'ypMPQTnS/QwZOxzK6FU1r+JmdTVvcyqRbftFaCAZht0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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