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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b2007e0ac0c9c8f2b09e7f93c619ce54304accea7e39f7cda22902a50acef8' 
  AND token = 'ZvPM1oTxzpc5QigXk7Q2ZHUGyNmpB4Hx4aMBwbaZ/zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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