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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '349ab54a5ef28e51760c73cf9fed44e87285320f900c6ee2c82317edb594110f' 
  AND token = 'YklGEz9METQm2zHHoGErt0N3x4z7obey1k/t0K13bkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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