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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f2824d8b523455576a1e6c89909c125176e42efc5b0dee49bdf097c264e248' 
  AND token = 'VcL1p4BGwNj2xqPC69DRjh9D4OyVKBB4hi6GtzUTKqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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