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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bcd11bf37ef6d6e985609232b002747fa7056f798f4df3cad012d40f99ef855' 
  AND token = '3Tj02ZFtEFmqJfzb0a1fKAdMWiImjEGVDDXtoyAETbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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