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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33752e5236fef4edb84224ccda0e9a4bfe41be0d3e2982111990cc81b1e4288e' 
  AND token = 'vgR5BtGu6Lq/1Uk4ZLOUsL8Ug2sVB/ZQjBTozP/3w84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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