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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '392b15c18fe1e470977c62e2a07e4b7c35b879f6ceaa4d07b2ef9c5f313cccf3' 
  AND token = 'OscPZvTmov+6U238X8Yb+dyx8R42ZuAOYXPCtAkvrI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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