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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3fdc06b2466e75736b19f030bf3143ce52a2d35ed3eb173e5140d1999d87343' 
  AND token = 'hhvzzjxuc69qxGc99OY2oM3PaZZzhisdqzwnfCkPK3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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