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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '594a460249e651f4176142569be83e64438536274609ec830707937bee13ce72' 
  AND token = '/3J5yXANnzg02M/a/4M6IcQ5X8+T4VnqyLuaLa9Oq+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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