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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '595798ced0c20def11156f8cf532ce5b178767d45e623ddc7008fb305a0c1a0b' 
  AND token = 'zzROAqNqzYnl1ZBcGrtk1C/NCI25M33P/kkXp6SggY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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