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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b7c43767865d8faf6fbe538e7488647c1c860f8b20eed740ddddcfb2b7ead5' 
  AND token = 'Ep1Y86QWAoEp6o8l8arFNJ38zzLv7hwW5Dwa1mk23iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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