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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dba17511faa08ed22fa7ee4d2f922366951e1e5022a47e5d3956f7c8805ea0e' 
  AND token = 'V/52EZxPpFRzYoScTtpeNrTjW/GTKz0KR3ztaT6fMAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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