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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae752280122edc14a0b766a53d6635e8d9d2c3ad468c25fac54d36c1162b2ea7' 
  AND token = 'JURdCH1XGK6B6eH9n6rvPmS+izAE8WSq/1lv8+ewx8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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