SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a028d570db4f98b2c584263d0427474d25ce81bf92fbe1297cac5b1c6f94d60' 
  AND token = 'LB7vz4Gn95AyZikHg2a1hhzQWQs3rxwpX9NoumsLpTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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